Preheat oven to 375°F. Line a baking sheet with foil.,Wash the potatoes and brush the outsides with vegetable or canola oil. Poke a few holes in the potatoes with a fork. Bake for 60 to 70 minutes, until potatoes are somewhat soft to the touch.,Let potatoes cool. Slice lengthwise and carefully scoop out the flesh into a bowl, making sure to leave the skin intact as your bowl.,______,Put the potatoes back in the oven for about 15 minutes, until cheese melts (if topping with cheese).